From owner-freebsd-current@FreeBSD.ORG  Mon Nov  8 15:05:05 2010
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id D93851065697;
	Mon,  8 Nov 2010 15:05:05 +0000 (UTC) (envelope-from jhb@freebsd.org)
Received: from cyrus.watson.org (cyrus.watson.org [65.122.17.42])
	by mx1.freebsd.org (Postfix) with ESMTP id A67D68FC1D;
	Mon,  8 Nov 2010 15:05:05 +0000 (UTC)
Received: from bigwig.baldwin.cx (66.111.2.69.static.nyinternet.net
	[66.111.2.69])
	by cyrus.watson.org (Postfix) with ESMTPSA id 590B446B06;
	Mon,  8 Nov 2010 10:05:05 -0500 (EST)
Received: from jhbbsd.localnet (smtp.hudson-trading.com [209.249.190.9])
	by bigwig.baldwin.cx (Postfix) with ESMTPSA id 85A328A029;
	Mon,  8 Nov 2010 10:05:04 -0500 (EST)
From: John Baldwin <jhb@freebsd.org>
To: freebsd-current@freebsd.org
Date: Mon, 8 Nov 2010 09:42:41 -0500
User-Agent: KMail/1.13.5 (FreeBSD/7.3-CBSD-20100819; KDE/4.4.5; amd64; ; )
References: <4CD7C8FC.900@icyb.net.ua> <ib8nas$9de$1@dough.gmane.org>
In-Reply-To: <ib8nas$9de$1@dough.gmane.org>
MIME-Version: 1.0
Content-Type: Text/Plain;
  charset="utf-8"
Content-Transfer-Encoding: 7bit
Message-Id: <201011080942.41546.jhb@freebsd.org>
X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.2.6
	(bigwig.baldwin.cx); Mon, 08 Nov 2010 10:05:04 -0500 (EST)
X-Virus-Scanned: clamav-milter 0.96.3 at bigwig.baldwin.cx
X-Virus-Status: Clean
X-Spam-Status: No, score=-1.9 required=4.2 tests=BAYES_00 autolearn=ham
	version=3.3.1
X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on bigwig.baldwin.cx
Cc: freebsd-fs@freebsd.org, Ivan Voras <ivoras@freebsd.org>
Subject: Re: another fuse panic
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>, 
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 08 Nov 2010 15:05:06 -0000

On Monday, November 08, 2010 6:35:55 am Ivan Voras wrote:
> On 11/08/10 10:55, Andriy Gapon wrote:
> > 
> > JFYI.
> > Fatal trap 12: page fault while in kernel mode
> 
> Can you find any set of circumstances which make this repeatable?
> 
> This panic apparently goes like this:
> 
> 1) used by devfs_open():
>  47 static struct cdevsw fuse_cdevsw = {
>  48         .d_open = fusedev_open,
> 
> 2) in fusedev_open():
> 119         fdata = fdata_alloc(dev, td->td_ucred);
> 
> 3) in fdata_alloc():
> 297         data->daemoncred = crhold(cred);
> 
> in other words, td->td_ucred from td passed to fusedev_open (presumably
> when the device is opened from the userland) appears to be NULL.
> 
> I don't know if there is any normal set of circumstances under which
> this is expected.

No, td_ucred should never be NULL.

-- 
John Baldwin